<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .fade-enter,.fade-leave-to{
            opacity:0;
        }
        .fade-enter-active,.fade-leave-active{
            transition:opacity .6s;
        }
    </style>
</head>
<body>
    <div id="temp">
        <button @click="show=!show">切换按钮</button>
   
    <transition name="fade">
        <p v-if="show">hello</p>
    </transition>
</div>

    <script src="/JS文件/vue.js"></script>
    <script>
        new Vue({
            el:"#temp",
            data:{
                show:true
            }
        })
    </script>
</body>
</html>